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| 型号： | TPA6020A2RGWRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.15 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, VQFN-20 |
| 文件页数： | 8/27页 |
| 文件大小： | 1948K |
| 代理商： | TPA6020A2RGWRG4 |
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f
c(LPF) +
1
2p R
F
C
F
where R
F
is the internal 40 kW resistor
(4)
fc +
1
2p R
I
C
I
(2)
f
c(LPF) +
1
2p 40 kW C
F
(5)
C
F +
1
2p 40 kW f
c(LPF)
(6)
-3 dB
fc
f
c(HPF) +
1
2p R
I
C
I
where R
I
is the input resistor
(7)
f
c(HPF) +
1
2p 10 kW C
I
(8)
C
I +
1
2p R
I
fc
(3)
C
I +
1
2p 10 kW f
c(HPF)
(9)
f
c(LPF) +
1
2p Ra Ca
(10)
TPA6020A2
SLOS458B – JULY 2005 – REVISED AUGUST 2005
Step 1: Low-Pass Filter
In the single-ended input application, an input capaci-
tor, CI, is required to allow the amplifier to bias the
input signal to the proper dc level. In this case, CI and
RI form a high-pass filter with the corner frequency
defined in Equation 2.
Therefore,
Substituting 10 kHz for fc(LPF) and solving for CF:
CF = 398 pF
Step 2: High-Pass Filter
The value of CI is an important consideration. It
directly affects the bass (low frequency) performance
Because the application in this case requires a gain
of the circuit. Consider the example where RI is
of 4 V/V, RI must be set to 10 k.
10 k
and the specification calls for a flat bass
Substituting RI into Equation 6.
response down to 100 Hz. Equation 2 is reconfigured
as Equation 3.
Therefore,
In this example, CI is 0.16 F, so the likely choice
ranges from 0.22 F to 0.47 F. Ceramic capacitors
are preferred because they are the best choice in
preventing leakage current. When polarized capaci-
Substituting 100 Hz for fc(HPF) and solving for CI:
tors are used, the positive side of the capacitor faces
CI = 0.16 F
the amplifier input in most applications. The input dc
level is held at VDD/2, typically higher than the source
At this point, a first-order band-pass filter has been
dc level. It is important to confirm the capacitor
created with the low-frequency cutoff set to 100 Hz
polarity in the application.
and the high-frequency cutoff set to 10 kHz.
The process can be taken a step further by creating a
Band-Pass Filter (Ra, Ca, and Ca)
second-order high-pass filter. This is accomplished by
It may be desirable to have signal filtering beyond the
placing a resistor (Ra) and capacitor (Ca) in the input
one-pole high-pass filter formed by the combination of
path. It is important to note that Ra must be at least
CI and RI. A low-pass filter may be added by placing
10 times smaller than RI; otherwise its value has a
a capacitor (CF) between the inputs and outputs,
noticeable effect on the gain, as Ra and RI are in
forming a band-pass filter.
series.
An example of when this technique might be used
Step 3: Additional Low-Pass Filter
would be in an application where the desirable
pass-band range is between 100 Hz and 10 kHz, with
Ra must be at least 10X smaller than RI,
a gain of 4 V/V. The following equations illustrate how
Set Ra = 1 k
the proper values of CF and CI can be determined.
Therefore,
16
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| TPA6020A2RGWT | 功能描述:音频放大器 Stereo Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA6020A2RGWTG4 | 功能描述:音频放大器 Stereo Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA6021A4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL |
| TPA6021A4EVM | 功能描述:音频 IC 开发工具 TPA6021A4 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TPA6021A4N | 功能描述:音频放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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